QR code · 4 modules
QR quiet zone
Four empty modules on every side, required for the scanner to find the symbol.
Key facts
| Required width | 4 modules |
|---|---|
| Sides | All four |
| Contents | Nothing — same color as the light background |
| Why | Finder-pattern detection |
| Common mistake | Placing the symbol flush against text or a border |
The margin is part of the code
Scanners locate a QR symbol by looking for the 1:1:3:1:1 dark–light–dark–light–dark pattern of the three finder patterns. A four-module light margin makes that ratio unambiguous. Cropping the margin, putting the code on a dark background or surrounding it with a busy pattern can all break detection even though the modules themselves are intact.
Designing around it
If a layout demands a tight frame, inset the symbol by at least four modules inside the light area rather than shrinking the quiet zone. Never place the code on a photo without a solid light panel behind it. The same rule applies on screen: leave padding inside the card that holds the canvas.
Frequently asked questions
Can the quiet zone be another light color?
It needs enough contrast against the dark modules. Off-white is usually fine; a mid-tone or patterned background is not.
Does a white border count as the quiet zone?
Yes, if it is at least four modules wide and not interrupted by other graphics.
Can I invert the colors?
Some scanners support inverted symbols, but many older ones do not. Keep dark modules on a light background for maximum compatibility.